Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '401e3a522f2f1ae90c4fc23e4a78da88836f93c5d56c2857a6810c5e6c5df8d4' 
  AND token = 'nDqAzPiHLVSWVGM0wQNxODR4UUrhm9npltwtulllfco=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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