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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c0172b59ceec6a8338cc8b286393de7b222e907eb653d8b554f0cee5e4fcdeea' 
  AND token = 'coEoExdfhRdW1A4DjdUKcpTaVKRNUsnIQe3WzNfbWHE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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