SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd720fdbe00fb369a2a1434b74db2917e7a2420cf47fe9df93f2ecc5a53ec58b0' 
  AND token = '/IjopUl40VZLjIp6R9Fu/60ACbbChWwJ8ABaZmlYRVw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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