As oil prices remain low [$40s] the price of gasoline will remain low [in USD] and that helps KK buy/store the same volumes with lower amounts of working capital.
Less WC = Fewer loans = lower interest payments = higher profits = higher dividends
Hopefully, a glut of oil will drop prices below $40. This means it's cheaper for Kenyans to drive and KK can sell more fuel.
Greedy when others are fearful. Very fearful when others are greedy - to paraphrase Warren Buffett