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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'df5890df0adce49c5ee850adbfb4ed4718955e2c168a4a06de77b02453a8fdfa' 
  AND token = '/x7Yy/UbiXEKs6qgac7/pL3PksuVmwYXepeJOqE4668=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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