I concur with the others on this one.
Anti-virus on Android is like putting training wheels on a bowling ball.
Really.
I don't even worry about sites that I go to with my phone.
That is not a very good habit, but I have absolutely zero valuable info on my device.
A phone is not going to get hacked unless the hacker can have physical posession of the device for a while.
It can also happen if you download something and install it, or if an app you install does that for you.
Basically, it's like a vampire,
You have to invite it into your phone.