SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5b7401f69eda91688d9b230e999cb4e04646a7618ea684bb381659749b36ceaf' 
  AND token = 'KigVPWwd8sOjN00upsaEYz53rFHIgXBaXxg1QVJRj1I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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