SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '596ae5dbfcb2f717202bdfc315475022ddb8593dd934ecc1e1d47a589344aaa0' 
  AND token = 'uGVBizkh+szX6wMeJDTZhhNifqrgPqHwPbSQm7TPyyk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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