SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9772fba5b6f58f314ffb777318f377dca3ba33870cab4138300bf5a82fa3761b' 
  AND token = 'WKg+XZ+pwKV0dPfvyFELKuFTsDGP+OdgOCsYdBZNKjk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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