The counter to radar and also laser is a jammer that initiates the explosive train too early.
BAE Systems are now trying to drum up interest in civil aviation for military grade counter measures.
Not cheap and not effective if not kept up to date. Obviously constantly updating the jammer capability will be an ongoing cost for the operator.
IR missile jammers are of course in use by certain airlines and by certain military operators.
To actually decoy the missile is a whole different ball game as you have to counter the tracker or guidance links and well as active radar seekers.