Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '10c2bc09aa0b86ccba37a974e0225cc1fcc533d7ed8f2f24d1ecebe14eacf5c4' 
  AND token = 'SxHLca4VlFDnZ9yQe8A9dKbhkcZUuBcxeDNUa+2/Md4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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