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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0c24b9e9f7bfd2f84f5a176dcf1115b740aa0965efa155bfd803f17fe5081145' 
  AND token = 'QQXWEeStWNIeiPksKzvG9mAqGm3qvGOK8a0HeidXOpw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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