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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '67a8d6655db7044b795894c7d2bf633b5a1ae1eae05c9d89f130e9c7dd14fdb9' 
  AND token = 'MBRd5Jpz7D57AXufkTCD5Nk1B6rhkdc1H7KBYKVaL6Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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