SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1b1802299b5de6a476d23b88d229f66c2cefa00a5156639e9f6b8a39aee8a95c' 
  AND token = 'TobzwGPniuW7nJnG8su8m6MKNBvHumDl3CoVNq8QUXI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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