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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f199490dd05201c37f2e2e9ff69aac93aa39bf8c283d1a6fbffe68b2ab4e8e17' 
  AND token = 'rP7rK13UhU98mUl4Jr5HOrn/rTDSBn8S4Hm3D9h9ZlA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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