SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '05f708e6685a431d4c120197968f298edb219c75a53c3a770c32042b7005375a' 
  AND token = 'EDEB1L+DwDTAqV/EavsZ8xnXJ0LiDhC7qfemhqkfbHo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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