SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f720ed322adbf85c4f315383b0c5f104b9b6ade43ea96260264ea327f9b1ab1f' 
  AND token = 'WyjJduvZYsl6JxgyFu8fzOXJcgJNybpr2mxPoFUO7II=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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