Sometimes you just need to override colorControlNormal like this:
<style name="RadioButtonStyle" parent="AppTheme">
<item name="colorControlNormal">@color/pink</item>
<item name="colorAccent">@color/colorPrimary</item>
<item name="android:textColorSecondary">@color/black</item>
</style>
And you will get a button like this:
colorControlNormal used for unchecked state and colorAccent for checked.