SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b18c956df647c40e4d739937f4eddeed29632fd5805a8949dea29c97c3ae423f' 
  AND token = '/STy7fbgsTxZOb9Wc2fuqZhdVUwlH6/h5ZSvRjIUvZY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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