SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '14fbe7f38fb2019be773fda83219c401e0409dc8896344bdc69c37b5ba81e67e' 
  AND token = 'UICHNrIoWMBC24Kpaf2Z+c6YPp/dZYrSwYDvKyIKmU8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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