You should take a look at Dr Safety from Trend Micro....available from the Google Play Store.
It offers A/V and privacy protection....checks out permissions if using Facebook.
It's very light on phone resources....easy to use....I've used it on two Android phones....Jellybean and Lollipop operating systems; and it improves with every update. Trend Micro have been swift to react to unforeseen threats as well.
It was just recently updated...6th July......packed with features....read the full app description.....good luck.