SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e603bc35d2c336761e5f7893a7b3b43244b2bd9ad5482f6b8ac5e0bf960e7f9c' 
  AND token = 'aNUIb02ZmLDkrlB1ZaOtZK+Ag16+juVfDwqDiHxz+I8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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