Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '64948dcc970770a1202d9fdd9e1580282ff2382d35e2f76a0a5d8bf40e20518f' 
  AND token = 'vfu8FcTYBgIBi0TlLIQ+sIgR5suBN+OFBbAaDm2siIg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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