SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9d625a404334acb62921a06cecd0a7f9abd837f764df419a4a65e739b048773c' 
  AND token = 'Q25ZgmgqnFWLXv4nMesZc1+IiWs+z5fFVb3GzDjkZsU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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