Calculating BJT Base Resistor Value
Somewhere around 0.5 to 1mA is fine, forced beta of 10-20. The transistor is specified at a Ic/Ib = 10, but 20 will be fine too, especially at only 1mA Ic.

So the resistor would be about (3.3V - 0.7V)/0.75mA  or about 3.3K\$\Omega\$.
The hFE is specified at Vce = 1.0V and you would like it to be more like 0.1V to minimize the losses in the transistor.
You could also use an inexpensive logic-level p-channel MOSFET such as AO3401A which will have negligible voltage drop.