SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '884348c5377a5b3778bf15cb1a54952756d8e225782d8b90e4d88c42ab870b33' 
  AND token = 'VlzYGuAzmmgTq+sk2uXl5/zgoyYJxM1H7n6qN3hR7Ms=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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