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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '199c4e09a75a3c3e41baa9a20d18179b35a42360f1dc8e899fcd33a81eddfaef' 
  AND token = 'OSGKRSIDkUmoFnoQAVowcnnxbnoZBEAesu3hVOIrM/g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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