SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '41bf0dfda4395d543a069d2c16c12624654231624ed25d6336cd020837aecb56' 
  AND token = 'RyxaJqwLtJx6QGB1J+sYpEN8gXofsKAIiPLrVqgjNQI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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