SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '179b94e66397d0c6fdcec16f16ef80e3c6e32cc05b67df4258548b7c52e0d7eb' 
  AND token = 'fKFJDXi3/hsdZznVjoggOCWfH879JAXq3920O03pQpA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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