SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '055d3949ceebd28a51ad3b321458a8aa5f76057e194248e1b24493aa64ab2588' 
  AND token = 'Nm5OQvg0ZYqLULWuZgM0NqXuZ4f7xPQHuuixj78VKL8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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