SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '64bc843abf3fb433d517e136b792dca2faf713b35f5eee72e70ba1e6374ac7af' 
  AND token = 'gdvZjegchGgAXU8WHUL5uQvpEVp62cyJuCBO5eFW/tY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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