SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f80c76a61c7d0e90d5ac5a509295c4ea3237a2374755930ac78b8f4e2482a197' 
  AND token = '32Zxhn4tgYi0lkh6uJMlOpHGpMEB636QIv6EgjZ/3Ag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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