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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6d0857f5352389d8bfff7fbaa3dc30de223f38a6412aed5cd0286a3429ddc4de' 
  AND token = 'XZ2xN1X2xjKuQDSGIUvgARpysUWT0W1mcy/yq7JsrSg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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