SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0b5b4dce45e7ba0c96194244b9947e1cbbf36d074c52e9f3ea0c56fe126086a0' 
  AND token = 'C+5KCaitVUMKOV7xZKBU6RWQLFJC/4rLrTAZF6MjZug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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