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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '30049f75e4f1de7369f9ecd071e80368923479a147880681e3ac451c10af6904' 
  AND token = 'UlO9YwA0XVIqMJSrSGgMwCj5kc1DCI+XUe7WiEowZ4A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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