Can the Apache detect infrared (IR) lock?
I think I have answered my own question from a little bit of research. 

Warfare systems such as Laser and Radar are detectable because they are active emissions (i.e. They have to make their own emission, wait for it to reflect back, then lock onto it).

Visual and Infrared are not easily detectable because they are passive. The IR Launcher or TV-Guided missile only requires the targets emission to lock onto, not its own in the example above, so there is no way you can detect being locked onto.