I would very strongly advise you against this idea. ASK only works reliably when the data it carries is protected and has some kind of error correction or re-send mechanism. What the receiver picks up isn't a '1' or a '0' but a '1' or noise, they are sensitive because they use super-regenerative detectors but the side effect is that in the absence of any input signal they produce random output. When used as intended they transmit a 'long' (eg. several milliseconds) of carrier to allow the receiver to lock and maybe adjust AGC followed by some rapid binary data. The receiver output has to be filtered to minimize anything shorter than a data bit then checked for errors just in case. Using them as simple signal detectors will not work and they will pick up signals up to several hundred KHz away from center frequency.
If you want a simple wireless remote on/off switch, either use FM modules which are far more immune to interference or use WiFi modules. These days you can buy ESP8266-1 WiFi modules for a fraction of the cost of a 433MHz ASK module and their data path is highly protected. You can even program them (VERY easy!) to switch the load automatically. For example tell it how many seconds on and how many seconds off and then enable or disable it remotely. You decide how it is used and control it according to your program. All you need is a 3.3V supply and at least two modules, one to send and one or more to receive. An ESP8266-1 has two general purpose IO lines. Even ESP32 modules cost less than the ASK modules and you can add Bluetooth to the communication method!
Brian.