SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '741e06bc57680a41917c0aa3264cb73a8de016e9b0021faf52a6bda4e71f8920' 
  AND token = 'cGIO+OPrCxoT+vVgw7TFNB93oqh/PkvwxMGZo80qB6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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