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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'aaca9bf224b3c75668acd6dd5dd5e1b03b7e7c7f59a29f7adfb8d5a70b8e8ab3' 
  AND token = 'GJz/1QvdiMjUHf1TOcHwnBNmf5uZ9NOlOOVfPt6DU04=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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