Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c0c70a98c868b073aa5204dd4cd1c6afe3957e33e568bfd605aa24fbd212f9ca' 
  AND token = 'RzvzmRVex2YoaiT5cloMi9nuiqj3a06jHwiGzw6n3aA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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