SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2e1be27bf7d5e74ff0dce3266265de45384a2ccb1171378f46b35965028449a1' 
  AND token = 'K5hjNIFkwoKFG+FKPoDN/utvMC60rX8g36AOeGYQuK8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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