SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'de9a339c16adbdf755cfec3c57b01ab1092cfd25a9785eeb24d816f6221f6657' 
  AND token = 'vTuXDCIhPkf5U55EKBLBkgOLYS55W+Bxg9ZwtxbZ/F4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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