SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e10ab8451c41ba3748676871b25c54ba71a8f4f464c6257421938bc16678ff3d' 
  AND token = 'akJLIYuPfP6Z5KBnXujbt5RnI7Vwjrj0guGgLz6CNhY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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