SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f0c5cc923963bb37a0ef7ebeeaad24089e0a21cc18d6f0fe898c9bce8244e154' 
  AND token = 'M81j+esKWeFO/Yvkl+FN+UUcZH4A9x5QXlCvVcJAZhw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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