Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3710bfcad776bdfd85a1d2d5843cffca1bd7eb82936f99812baa63cd263c2bcf' 
  AND token = 'JNQNxvMd6RJFhjAGWWxa/dxoe+hKhDQFbSLB3dr80TM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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