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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a039f43a5ce34b76ac1b0bce695a9ad332e638e71b031d11653f101e8ed0e14f' 
  AND token = '5y/SD05bsCJ9OPJBg8YP1hTw/ARz6Unx5kzousGDSEw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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