SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f4c313810f6891b2248ad113f7f990fc2309e433fd7de6c455db25b7a0cdd427' 
  AND token = 'gL1Xj7XJ2dRSB4lG0ujHyYmHYONe70GVcOqN8poviD8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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