Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f6d346d5b3105bc67bf3ce49a6d221b9cd14640090bf02c50da4b79f6a16bf55' 
  AND token = '91iX98wOMI+XBEvTf1FN540ON33XhGEcH8x23LrFZSo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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