One gameplan for getting rid of ticks, is a good soak in some dish-soapy water. Just make sure the water is warm, not hot, and you may want to put a UTH under the Rubbermaid in which you soak the snake, to keep the water frrom cooling. I usually soak them for an hour or so, if I am checking for mites, but with the tick I'd look every few minutes to see if the little nasty has let go yet.
Good luck; I had a snake with ticks, and I know how stressful it can be.