Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ed1503afc4767be6a1fd6cf9e7f1ac16cfde42c0666e60b141d19feb7715bd68' 
  AND token = 'gPCFy9j+xyxJRLZj15Jez5iZH8FXr2ZBdO2y9Hm5zCg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}