SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5827c632b3c1a039fabf0f65329853092dc3704af075b5c44ca2ab48ca7a85a5' 
  AND token = 'C7vILAJ+liVQU3IEZ6OFqp5CdYiV5/cNL0Qg/N/XmzU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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