SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '892737c77e81dcb00a817df8a3560a6295d6e3b9aa7572d89424e6120381ba90' 
  AND token = 'QdtUJBP9PcvuLt6YmBrYcJC92Z/8kZhWfZqQpej59fY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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