primary key that doesn't autoincrement

[D Woods]

I'm a novice at setting up a mysql database and don't know the answer to
this. I usually set up my primary keys as autoincrementing ID fields. Now I
need to have a primary key that isn't an autoincrementing field as I want to
store the CFTOKEN and use it as the primary key. Can I not have a
non-autoincrementing primary key in mysql?

Thanks