STOCKHOLM–Sweden’s central bank lowered its key interest rate on Wednesday, with policymakers signaling they might be finished with their monetary policy easing. The Riksbank cut its key interest rate by a quarter of a percentage point to 2.25%, in line with a poll of economists conducted by The Wall Street Journal ahead of the decision. It said in its statement Wednesday that given the limited risk of inflation becoming too high, coupled with weak economic activity, it decided to make the cut at its first meeting of the year.