What is the smallest number of matches with Bonus Pts of 19 and Total Points greater than 421?
CREATE TABLE "1966_season_finished_1st_54pts_out_of_19" (
  "rider" text,
  "matches" real,
  "rides" real,
  "bonus_pts" real,
  "total_points" real
);
SELECT MIN("matches") FROM "1966_season_finished_1st_54pts_out_of_19" WHERE "bonus_pts"=19 AND "total_points">421;