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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0752084fe34cd13c886be50dcd17a90f6fd9e42963fa171898619a08698b5dac' 
  AND token = '/XjPC9CZNdiXIjufxEa99OeO3jZZI6QXWCKx5HrZoN8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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