SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '815cac155d1a7222f8b00a28ad583e5ced3365d8b9147983c9ecdc184c976a5e' 
  AND token = '72UV0mZDVpu7HlT/mNWYN++BLGRwy92T8CBzPXu35no=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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