As far as I'm aware, it is not possible to appeal a yellow, even if the yellow is a second booking.
There appears to be no intent to harm otherwise it could have been a straight red. As poor as the referee was, mostly because Terry should have been sent off earlier, Benteke gave Mason little choice but to give him a second yellow. Whilst publically supporting Benteke and being wary of keeping his services this summer, I imagine Lambert was very annoyed with our Christian.