It's definitely a tick. I'd suggest using tweezers instead of your fingers to get it out, and try to grab it as far up the body towards the head as possible - you don't want to go squeezing the contents of the tick's gut into Archy. It's not a good idea to go touching it with your bare fingers for the simple reason that it's a tick and it carries what are most likely obscure West African diseases that you have no immunity to.
Have you taken your snake for a vet check? You should always get a new snake vet checked, to make sure they're healthy and have no parasites. They'll do a test called a fecal flotation, you just take them your snake's poop and they check for creepy crawlies like worms. Definitely put it on your to do list, since you've got a BP who's most likely wild caught.