SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '79249f724777e397f87500d5d98ac50e9e08b7504865f0dc61cf5fce1d091950' 
  AND token = 'J7WNGejt23EsxKV/OUMWbCn3OhqoZ2w44XrMrS/YnqI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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