Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ac5b81df4cd363ca9337258f328e29ce665ec44991115751e994779503154152' 
  AND token = 'c1TNl40HhsHbr0TTj5XQJlZUIF4ysToEOHy2TqiHcME=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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