SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8c9b278f4ef272e8ac46520f6d72f26e0c4748b059cfd7cc782b9d7bda144645' 
  AND token = 'r82enbQ/BjfmFclQVRr3Cp5LNvHK01uiMI/DhvF6Xpw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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