SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '06d3bce87abf08b796a46e8b1f1067f8236b45dc436c5338b5a87b6d2310be4d' 
  AND token = 'j3NSTJD9WocRS3XLqZb99uvogBlu/JW0D4+XHEtGM0o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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