SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9c485261c9754d5ba7b36dcb360669b2978149b5188cc0fd420e42346f654046' 
  AND token = '2IRh+jbnJoZBU6ynU3fuBsjcyXKXrl1cFiwU6JVNKNk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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