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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ae3df79b7387f612281ddf438c7f7bd04269f644389d4b4002018700b7e07314' 
  AND token = 'nk7oL0I17OtMWrcEc7FptUJhRy9b/FN3YQ+MMm9CKsw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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